Johnson Lake

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Johnson Lake (Grant Lake) is a 56-acre lake with a maximum depth of 70 feet located three miles northeast of the town of Clearbrook in northern Clearwater County. Johnson Lake is managed primarily for walleye, with northern pike, yellow perch and pumpkinseed managed as secondary species. Fish habitat is marginal in Johnson Lake. Water less than fifteen feet in depth is limited, and much of the water column becomes devoid of oxygen during summer months. Johnson Lake also has a history of winterkill events, although none have occurred recently. Water quality measurements taken in July of 2013 showed adequate oxygen levels for fish down to a depth of 14 feet and a Secchi disc reading of 6.5 feet, with a heavy algal bloom noted. Johnson Lake is stocked with walleye fingerlings on alternate years, which has provided some walleye fishing opportunity in an area with relatively few fishing lakes.The 2013 walleye catch rate of 3 fish per gill net (3/GN) is near the upper end of the normal range for Lake Class 28 lakes. Walleye ranged in length from 16.5 inches to 24.5 inches in length, with an average size of 19.1 inches and 2.54 lbs. Trap nets captured good numbers of smaller walleye (12.4 inch average size) indicating the success of recent stockings. A total of seven year classes of walleye were identified in the assessment. The northern pike catch rate of 11/GN was above the normal range (2.75/GN to 8.67/GN) for Lake Class 28 lakes. Pike up to 27.7 inches in length were captured, with an average size of 21.3 inches in length and 2.3 lbs. Yellow perch were fairly abundant in the assessment (21.3/GN) but most perch captured were less than 7 inches in length. Trap nets sampled low numbers of bluegill (5.11/TN). Bluegill were smaller than most anglers prefer, with an average length of 5.5 inches. Other species captured in the 2013 assessment were black bullhead, white sucker, rock bass, and pumpkinseed.